Device for indicating the oil circulation and oil pressure



Apr. l7, 1923.

W. SCHWERDTFEGER DEVICE FOR INDICATING THE OIL CIRCULATION ANDVOILPRESSURE Filed Sept. 10 1921 2 Sheets-Sheet l um :m

PHI/TOR Apr. 17, 1923.. L4-5L84l w. SCHWERDTFEGER DEVICE FOR INDICATINGTHE OIL CIRCULATION AND OIL PRESSURE Filed Sept. 10 1921 2 Sheets-Sheet2 Patented Apr. 17, 1923.

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WALTER SGHi/VERDTFEGER, OF UNTERTURKHEIDT, GERMANY, ASSIGNOR TO DAIMLER-MOTOREN-GESELLSCHAFT, OF UNTERTURKHEIM, GERMANY.

DEVICE FOR INDICATING THE OIL CIRCULATION AND OIL PRESSURE.

Application filed September 10, 1921. Serial No. 499,853.

To all whom it may concern:

Be it known that I, \Vnrzrnn Sorrwnnn'rrncnn, a subject of the State oflVurttemberg, ermany, resiuing at Unterturkheim,

l/Vurttemberg, Germany, 2 Hangstrasse,

have invented certain new and useful Improvements in a Device forIndicating the Oil Circulation and Gil Pressure, of which the followingis a specification.

It is known to provide machines and engines, for instance the motors ofmotor cars, flying machines, and the like, the working parts of whichreceive the lubricant through the medium of a circulation conduit, with5 two indicators, one of which makes visible the circulation. proper,whereas the other shows the pressure under which the oil circulates.

The present invention relates in general to a device combining the twoindicators, andin particular to the special construction of this device,as fully described hereinafter. In order to make my invention moreclear, I refer to the accompanying drawings, in which Figure 1 is afront view of one form of construction of the combined indicators, thecover of the device and the dial being removed; Figure 2 is a horizontalsection through the device shown in Fig. 1; Fig ure 3 is an illustrationsimilar to Figure 1 but showing a modified. form of construc tion; andFigure 4 is a horizontal section through said modified construction,

Referring to Figures 1 and 2, the casing 1 has circular piston guidechannels 2 and 3 enclosing correspondingly curved pistons 4 and 5 eachrespectively subject to the pressure of springs 6 and 7. The space atthe end of each piston opposite to the springs communicates with the oilsupply conduit, and the pressure of the oil counteracts, thus, thepressure of said springs. Each piston has a conical transverse bore intowhich extends an arm 8, or 9 respectively, afiixed to a spindle 10, or11 respectively. The spindles extend from the rear to the front, viz,through the front plate of the casing, as well as through the dial 12,and are provided with hands 13 and 14 co-operating with said dial. Therear ends of the spindles and 1]. where the arms 8 and 9 are attachedhave a larger diameter and are formed with conical necks 15 and 16 whichare pressed by springs 17 and 18 into correspondingly shaped cavitiesprovided in the central main plate of the casing. Between this plate andthe dial conical protective disks are aliixed to the spindles 10 and 11;they prevent the oil flowing along the spindles and from obtainingaccess to the dial.

The manner of operation of this device is as follows: The circulatingoil enters through the passage 21 into the space at the upper end oi"-the piston 4 which has a lug 4 preventing the piston from closing saidpassage. The oil which is under pressure displaces the piston 4 andcompresses the spring 6 accordingly. The guide-channel wherein thepiston 4 is displaced c01nmunicates with the central space 24 of thecasing by a passage 22 which is opened when the piston 4 has beensufliciently displaced. Then the oil flows from said guide channel intothe space 24. Owing to the displacement of the piston 4, the arm 8 isturned, as is, consequently, also the hand 13. The extent of thedisplacement depends, of course, upon the pressure of the oil and thusalso upon the amount of oil fed into the space at the upper end of thepiston 4. If the quantity of the oil ted changes, the position of thepiston 4 and of the hand 13 also changes, the latter then indicating thechange that has taken place.

The space at the upper end of the piston 5 also communicates with thecentral space of the casing through an aperture 25 through which the oilenters from said central space into said other space, whereby the piston5 is correspondingly displaced and the hand 14 turned. The piston 5 hasa lug 5 corresponding to the lug 4 of the piston 4 and preventing thepiston 5 from closing the. aperture 25. The hand 13 indicates thecirculation as such; the hand 14 indicates the pressure, under which thecirculation proceeds. The oil leaves thecentral space'24 through abranch 27. The space containing the spring 7 does not communicate withthe central space, but is connected by an aperture 26 either with theatmosphere or with a space where the pressure is below that of theatmosphere.

Referring now to Figures 3 and 4, the casing 28 is provided with twoparallel cylinders '29 and 30 containing pistons 31 and 32. Each pistonis coupled with one arm 33, or 34 respectively, of double-armed leversaffixed to the spindles 35 and 36 of the hands 40 and 41. The other armof each of said levers is subjected to the pull of a spring 43, or 44respectively. Each spindle has a conical central part 37, or 38respectively, which is subjected to the pressure of a spring 39; theco-operation of these parts is just like that of the parts 15 and 17, or16 and 18 respectively, of Figure 2. The manner of operation of thisform of construction of the device is as follows:

The oil passes through the conduit 45 into the cylinder 29, displacesthe piston 31 to the left, and opens'finally the outlet 46 through whichit finds access into the central space 47. If the amount of'the oil fedchanges, the sectional area of the outlet 46 also changes which changeis indicated by the hand 41 upon the corresponding portion of the dial.From the central space 47 the oil enters into the cylinder 30 anddisplaces the piston 32 to the left, whereby the hand 40 is turned. Thespace 48 communicates through an aperture 49 either with the atmosphereor with a space where the pressure is below that of the atmosphere. Thesprings 43' and 44 respond to every change of the pressure and move thepistons and the hands back to the right. The oil leaves the centralspace 47 through the branch 50.

To prevent the oil from reaching the dial, the spindles of the hands arein this instance also provided with conical disks 51 and 52.

Having thus particularly described the nature of my invention, what Iclaim as new and desire to secure by Letters Patent of the United Statesis:

1. A device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising, incombination, two pistons; cylinders containing said pistons; a casingcontaining said cylinders; a connection between the oil supply and oneof the cylinders; a connec tion between the same cylinder and the spacewithin said casing; a connection between this space and the othercylinder; a connection between said casing space and the lubricatingconduit; and means for indicating the oil circulation and the oilpressure, as set forth.

p 2. A device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising, incombination, two pistons; cylinders containing said pistons; a casingcontaining said cylinders and a casing space; springs so arranged insaid casing as to be adapted to displace said pistons, contrarily to thepiston movement due to the pressure of the oil; a connection between theoil supply and one of the cylinders a connection between the saidcylinder and the space within the casing; a connection between thisspace and the other cylinder; a connection between said casing space andthe lubricating conduit; and means for indicating the oil circulationand the oil pressure, as set forth.

3. A device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising, incombination, two parallel cylinders; pistons in said cylinders; a dial;two hands adapted to co-operate with said dial; means for transmittingthe motions of the said pistons to said hands; a casing containing thesaid. cylinders and having a space communieating with both cylinders, aswell as with the lubricating conduit of the respective ma- ,chine orengine; and a connection between the oil feed conduit and said space.

4. A. device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising, incombination, two parallel cylinders; pistons in said cylinderes; a dial;two hands adapted to co-operate with said dial; a common casing for thebefore mentioned parts; springs so arranged in said casing andassociated with the said pistons as to be adapted to be placed undertension by the motions of the pistons and capable of displacing saidpistons in the reverse direction proportionately to any decrease in theforce exerted by the oil; said casing having a space communicating withthe two cylinders and with the lubricating conduit of the re spectiveengine or machine; a connection between the oil supply conduit and oneof the said cylinders; and a connection between the other cylinder and aspace wherein the pressure is below that of the oil, substantially asdescribed.

5. A device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising, incombination, two pistons; cylinders containing said pistons; a casingcontaining said cylinders; a connection between the oil supply and oneof the cylinders; a connection between the same cylinder and the'spacewithin the casing; a connection between this space and the othercylinder; a connection between said casing space and the lubricatingconduit; a dial; two hands adapted to cooperate with said dial; spindlesto which the said hands are affixed; protective disks attached to saidspindles means for transmitting the motions of the said pistons to thesaid spindles; and springs so arranged as to be adapted to displace thepistons proportionately to any decrease in the forceererted by the oil,substantially as and for the purpose set forth.

6. A. device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising, incombination, means for indicating the exill) conducting the oil to theinstrumentalities which control both said indicators.

8. A device for indicating the oil circulation and oil pressure in thelubricating conduits of machines and engines, comprising a casing, twocylinders in said casing, a piston in each of said cylinders, meanscontrolled by one of said pistons for inclicating the oil circulation,means controlled by the other piston for indicating the oil pressure,and connections for conducting the oil first to one and then to theother of said cylinders.

WVALTER SCHWERDTFEGER.

